331 



Phragmidium Potentillae-canadeyisis Diet. Hedw. Beibl. 42:179. 1903. 

 Frovimea obfn.m Arth. Bull. Torrey Club 44:503. 1917. 

 On Rosaceae: 



Potentilla canadensis L., Newark, September 1907 (2004). 



32. PiLEOLARiA ToxicODENDRi (Berk. & Rav.) Arth. N. A. Flora 7=:147. 



1907. 

 Uromyces Toxicodendri Berk & Rav. Grevillea 3:56. 1874. 

 On Sapindaceae: 



Rhus radicans L., Stanton, Sept. 10, 1885, A. Commons (184). 



33. POLYTHELis FUSCA (Pers) Arth. Result Sci. Congr. Bot. Vienne 341. 



1906. 

 Aecidium fuscum Pers. Linn. Syst. Nat. 2": 1873. 1791. 

 Puccinia fusca Wint. Rabh. Krypt. Fl. 1:199. 1884. 

 On Ranunculaceae : 



Anemone quinque folia L., Newark, April 13, 1908, (2255). 

 The mycelium of this species is perennial as first shown by DeBary 

 (Monatsber. K. Akad. d. Wiss. Berlin 1865). Plants affected by this 

 rust are deformed, slightly dwarfed and seldom if ever flower. The 

 leaves are paler and narrower than normal and are considerably 

 thickened. 



34. Puccinia Agropyri E. & E. Jour. Myc. 7:131. 1892. 



On Poaceae: 



Agropyron rejjens L., Newark, August 23, 1907 (1716). 

 No successful culture work has been conducted with this sub-epider- 

 mal leaf rust on this host. It is indistinguishable from the normal form 

 of P. tomipara Trel. on Bromus sp. and with other similar forms on 

 various grasses described under a variety of names including P. ohlit- 

 crata Arth. on Agropyroyi sp., P. alternans Arth. on Bromus sp. and 

 P. cinerea Arth. on Poa sp. Considerable culture work has been done 

 by Arthur showing that these forms have aecia on Ranunculaceae and 

 are probably identical. It is to be expected that aecia for leaf rust on 

 Agro2)yron repens will also be found to be on Ranunculaceae. The most 

 probable connection is with Clematis. 



